Improvement in hand-saws



UNITED STATES PATENT OFFICE.

THOMAS D. ROBERTS, OF UTIOA, NEW YORK.

IMPROVEMENT IN HAND-SAWS.

Specification forming part of Letters Patent No. 3S,33Sdated April 28,1363.

To all whom it mary concern:

Be it known that I, THOMAS D. ROBERTS, of Utica, in the county of Oneidaand State of New York, have invented a new and useful Improvement inHand-Saws, such as are fitted in a wooden frame and strained taut byoperating or adjusting the ends of the frame; and I do hereby declarethat the following is a full, clear, and exact description of the same,reference being had to the accompanying drawing, making a part of thisspecification, said drawing being a side view of my invention.

This invention relates to an improved mode of constructing thesaw-frame, and also in an improved means for straining the saw, wherebythe latter may always be kept withthe greatest facility in a proper tautstate for use, and the saw also readily relaxed and taken from the framewhen it is necessary to le or set it.

This invention consists, first, in constructing the frame of a singlepiece of wood bent or curved in such a manner as to form the two endpieces of the frame to which the saw is attached.

The invention consists, second, in the employment or use of a nut andscrew, and a brace, arranged substantially as hereinafter shown anddescribed, for the purpose of' straining the saw.

To enable those skilled in the art to fully understand and construct myinvention, I will proceed to describe it.

A represents the frame of the saw, which frame is constructed of asingle piecel of suitable hard elastic wood bent in bow form, as clearlyshown in the drawing. B is the saw, which may be constructed in theusual way, and have its ends fitted in the frame A, one end of the sawbeing fastened in the extreme end of one part of the frame, as shown ata, and the other end of the saw fastened in the opposite part of theframe some distance above its end, as shown at b, so as to leave aportion, c, for a handle below b.

C O represent two pieces or bars of wood of straight form, the outerends of which have tenons formed on them to iit loosely in the frame A,one at each end of the same. On the inner ends of these bars (l C thereare fitted metal screws d, one being a right and the other a left handscrew. On these two screws a nut, D, is fitted, said nut being pro videdwith aright anda left female screw to t on the screws d of the bars O O.From this description it will be seen that by turning the nut D the barsO O may be simultaneously forced outward or drawn inward, said resultbeing attained by the nut D and screws d d. When the bars O C are forcedoutward the sawB will be strained taut, as the two ends of the frame Awill be forced apart or distended, and by drawing inward or toward eachother the two bars O O, the saw will be relaxed, as the ends of theframe will be allowed to spring back to their original position. Byhaving two screws, d d, a right and a left hand one, attached one toeach bar O, the operation of the straining devices will be quicker thanif one screw only were employed; but one screw d mightbe used withadvantage, the nut D being allowed to turn loosely on the bar O, whichis not provided with a screw.

By this arranginent a very simple and economical hand-saw of the classspecified is obtained, one that will admit of the saw being strained andrelaxed with facility. In consequence of having the frame constructed ofa single piece of wood it cannot be racked or vtwisted out of propershape, as is the case with the ordinary saw-frames of this class. Thedevice at the same time may be manufac tured at a moderate cost, and ithas no parts liable to become deranged by use or get out of repair.

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is n l. A saw-frame, B, constructed ot' asingle piece of wood bent in the form substantially as herein shown'anddescribed.

2. The nut l) and screws d d, applied to the ybars O C, and the latterarranged with the saw-frame, either constructed as shown or in anyproper manner, for the purpose of straining the saw, as set forth, andthis saw-straining device I claim wh ether one screw d is used or bothof them, as herein set forth.

3. The combination of the saw-frame B, constructed of asingle piece ofwood, as shown, with the nut D, bars O C, and screw or screws d d, asherein specified.

THOMAS D. ROBERTS.

Witnesses:

GEO. T. RosE, W. E. GooDRIcH.

